As per what I see, it isn't applicable for R12.
The document mentions that it is applicable for 11i.
However, there is nothing specific to 11i and it is supposed to work in R12.
You may try it and see if it works.
Per the latest RCD documents, there will be a new feature in 12.2.6 that allows a form to run in ready only mode at the responsibility or user level.
Check section 220.127.116.11. Oracle E-Business Suite Forms in Read-Only Mode on the Responsibility or User Level (page 40) of the Applications Technology RCD in the following document:
R12.1 / R12.2 : Oracle E-Business Suite Releases 12.1 and 12.2 Release Content Documents (Doc ID 1302189.1)